WO2006094179A2 - Apparatus for and method of using an intelligent network and rfid signal router - Google Patents

Abstract

An RFID router which is maded upon of a router (650) routes RF RFID signals to on an RFID antennae system and a data router (610) which routes data signals to an RFID antenna system per Fig 6.

Description

APPARATUS FOR AND METHOD OF USING AN INTELLIGENT NETWORK AND RFID SIGNAL ROUTER

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application claims priority from U.S. Provisional Patent Application

Nos. 60/657,709, filed March 3, 2005; and 60/673,757, filed April 22, 2005, which are

hereby incorporated by reference in their entireties.

[0002] This application also expressly incorporates the following U.S. Patent

Applications by reference in their entirety: U.S. Patent Application Nos. 10/338,892,

filed January 9, 2003; 10/348,941, filed November 20, 2003; and U.S. Provisional

Patent Application Nos. 60/346,388, filed January 9, 2002; 60/350,023, filed January

23, 2002; 60/469,024, filed May 9, 2003; 60/479,846, filed June 20, 2003; and 60/571,877

filed May 18, 2004.

BACKGROUND

[0003] Radio frequency identification (RFID) systems typically use one or more

reader antennae to send radio frequency (RF) signals to items comprising RFID tags.

The use of such RFID tags to identify an item or person is well known in the art. In

response to the RF signals from a reader antenna, the RFID tags, when excited,

produce a disturbance in the magnetic field (or electric field) that is detected by the

reader antenna. Typically, such tags are passive tags that are excited or resonate in response to the RF signal from a reader antenna when the tags are within the

detection range of the reader antenna.

[0004] The detection range of the RFID systems is typically limited by signal

strength over short ranges, for example, frequently less than about one foot for 13.56

MHz systems. Therefore, portable reader units may be moved past a group of

tagged items in order to detect all the tagged items, particularly where the tagged

items are stored in a space significantly greater than the detection range of a

stationary or fixed single reader antenna. Alternately, a large reader antenna with

sufficient power and range to detect a larger number of tagged items may be used.

However, such an antenna may be unwieldy and may increase the range of the

radiated power beyond allowable limits. Furthermore, these reader antennae are

often located in stores or other locations where space is at a premium and it is

expensive and inconvenient to use such large reader antennae. Alternatively,

multiple small antennae may be used. However, such a configuration may be

awkward to set up when space is at a premium and wiring is preferred or required

to be hidden.

[0005] Current RFID reader antennae are designed to maintain a maximum read

range between the antenna and associated tags, without violating FCC regulations

regarding radiated emissions. When tagged items are stacked, the read range of an

antenna can be impeded due to "masking" of the stacked, tagged items. As a result, the masking limits the number of tags that an antenna may read at a given time, and

consequently affects the number of products that may be read.

[0006] Resonant reader antenna systems are currently utilized in RFID

applications, where numerous reader antennae are connected to a single reader.

Each reader antenna may have its own tuning circuit that is used to match to the

systems characteristic impedance. However, multiple reader antennae (or

components thereof) cannot be individually controlled when they are connected by

a single transmission cable to a reader unit.

SUMMARY

[0007] Apparatuses, systems for, and methods of transporting digital signals and

radio-frequency ("RF") signals are disclosed. In accordance with a preferred

embodiment of the invention, an intelligent network, a device, and corresponding

methods and systems are provided for transporting RF signals to, for example, an

RFID antenna and transporting digital signals to, for example, a controller. In a

preferred embodiment, the intelligent network is implemented with a manager unit

for controlling a plurality of network devices to facilitate the efficient management

of RFID-enabled devices. The devices may include a combination router/switch,

which has the capability of switching both digital data and RF data, RFID readers,

RFID reader/writer pads, and other devices (e.g., antennae). In accordance with preferred embodiments, the intelligent network allows enhanced flexibility in

controlling systems for interrogation of RFID antennae.

BRIEF DESCRIPTION OF THE DRAWINGS

[0008] FIG. 1 illustrates the front side of a display fixture in accordance with an

exemplary embodiment of the invention;

[0009] FIG. 2 is a block diagram illustrating an exemplary antenna system in

accordance with an exemplary embodiment of the invention;

[0010] FIG. 3 is a block diagram illustrating another exemplary antenna system

incorporating primary, gondola, and shelf controllers to select antennae in

accordance with an exemplary embodiment of the invention;

[0011] FIG. 4 is a block diagram illustrating another exemplary antenna system

further incorporating additional gondola controllers in accordance with an

exemplary embodiment of the invention;

[0012] FIG. 5 is a block diagram illustrating another exemplary antenna system

further incorporating multiple RFID readers in accordance with an exemplary

embodiment of the invention;

[0013] FIG. 6 is a block diagram illustrating an exemplary combination router in

accordance with a preferred embodiment of the invention; [0014] FIG. 7 A is a schematic diagram illustrating an exemplary switching

apparatus for routing RF signals in accordance with a preferred embodiment of the

invention;

[0015] FIG. 7B is a simplified block diagram illustrating an exemplary switching

apparatus for routing RF signals in accordance with a preferred embodiment of the

invention;

[0016] FIG. 8 is a block diagram illustrating an exemplary system for routing

data and RF signals in accordance with a preferred embodiment of the invention;

and

[0017] FIG. 9 is a flow chart illustrating an exemplary method for routing data

and RF signals in accordance with a preferred embodiment of the invention; and

[0018] FIGs. 10-13 illustrate schematic representations of an exemplary

implementation of a process in accordance with a preferred embodiment of the

invention for determining an RF network topology; and

[0019] FIG. 14 is a block diagram of an exemplary IntelliRouter™ in accordance

with a preferred embodiment of the invention; and

[0020] FIG. 15 is a block diagram of an exemplary IntelliSwitch™ in accordance

with a preferred embodiment of the invention; and [0021] FIG. 16 is a block diagram of an exemplary IntelliPad™ in accordance

with a preferred embodiment of the invention;

[0022] FIG. 17 illustrates an exemplary deployment of IntelliManager™ across

several sites in accordance with a preferred embodiment of the invention;

[0023] FIG. 18 is a block diagram of hardware and software components in an

exemplary implementation of a preferred embodiment;

[0024] FIG. 19 is a block diagram illustrating an RFID Read Process in accordance

with an exemplary implementation of a preferred embodiment;

[0025] FIG. 20 is a flow chart of a Read process in accordance with an exemplary

implementation of a preferred embodiment;

[0026] FIG. 21 is a block diagram of a Reader Instance Manager in accordance

with an exemplary implementation of a preferred embodiment;

[0027] FIG. 22 illustrates the creation of an RF path in accordance with an

exemplary implementation of a preferred embodiment;

[0028] FIG. 23 illustrates the destruction of an RF Path in accordance with an

exemplary implementation of a preferred embodiment;

[0029] FIG. 24 is a block schematic illustration of an exemplary implementation

of a preferred embodiment of the invention; and [0030] FIG. 25 illustrates the response of an IntelliManager™ to faults on the

network in accordance with an exemplary implementation of a preferred

embodiment of the invention.

DETAILED DESCRIPTION

[0031] Preferred embodiments and applications of the invention will now be

described. Other embodiments may be realized and changes may be made to the

disclosed embodiments without departing from the spirit or scope of the invention.

Although the preferred embodiments disclosed herein have been particularly

described as applied to the field of RFID networks, devices, methods, and systems,

and other signaling networks, devices, methods, and systems (e.g., DC pulse

communications, and voltage-level based communications (Transistor-Transistor

Logic (TTL), etc.)), it should be readily apparent that the invention may be

embodied in any technology having the same or similar problems.

[0032] FIG. 1 shows a front view of a display fixture, incorporating three

backplanes 1, 2, and 3 with attached shelves 4 and 5. In the examples herein,

antennae will be described that may be placed in, for example, approximately

horizontal planes as at positions 6 and 7 in accordance with preferred embodiments

of the invention. This display fixture may be useful for monitoring inventory of

RFID tagged items, or other marked or tagged items, such as optical disk media 8 (shown on the shelves). As used herein, the term "RFID tagged item" refers to an

item marked or tagged in any manner capable of detection, including, but not

limited to, RFID, DC pulse communications, and voltage-level based

communications (TTL, etc.). As used herein, the term "RFID system," "RFID

antennae system," "RFID reader," "reader antennae," or "RFID feed system" refers

to any system or device capable of transporting signals related to detection of

marked or tagged items including, but not limited to, RFID, DC pulse

communications, and voltage-level based communication systems. It is understood

that any RFID tagged item can be used in place of optical disk media 8. Preferably

optical disk media 8 has an attached RFID tag 9 that can be detected by an RFID

system. The display fixture of FIG. 1 is an exemplary implementation of a preferred

embodiment, but it should be understood that other fixtures or non-fixtures may

embody the invention, and that antennae described here can be used in orientations

other than the exemplary horizontal orientation.

[0033] In accordance with an exemplary embodiment of the invention, a multiple

RFID antenna system is illustrated in FIG. 2. The exemplary antenna system

includes reader antennae 10, with associated antenna boards 20, gondola controllers

30, shelf controllers 40a, 40b, 40c, and an RFID reader 50. The antenna boards 20

may not be needed for some antenna designs. If present, antenna boards 20 may

include tuning components (e.g., tuning circuitry) and other components (e.g., gondola controllers 30, shelf controllers 40a, 40b, 40c) and may include logic and

switching controls as necessary to perform the operations described herein. In one

embodiment the antenna board may comprise reader antenna 10.

[0034] The RFID feed system shown in FIG. 2 incorporates an RFID reader 50

and a feed line 45 (e.g., a coaxial cable) leading to a structure 70 (e.g., a store display

fixture or "gondola"). When additional gondolas are used, the additional gondolas

(e.g., gondola 71) may be joined into the circuit as described below.

[0035] The RF signal in cable 45 may be routed by gondola controller 30 so that it

is sent to shelves on gondola 70, or bypasses gondola 70 and continues on to

additional gondolas such as gondola 71. In one preferred embodiment, the term

"RF signal" refers to radio frequency signals used, for example, to interrogate an

RFID reader antenna or group of antennae. However, it is understood that the term

"RF signal" also refers to any other signals capable of being used with the

exemplary devices, systems, and methods including, but not limited to, DC pulse

communications, or voltage-level based communications (TTL, etc.).

[0036] In this embodiment, the term "shelf refers to one shelf or a group of

shelves served by a single shelf controller 40a, 40b, 40c, and the term "gondola"

refers to a structure including one or more shelves. The terms "shelf" and

"gondola/' however, are not meant to be limiting as to the physical attributes of any

structure that may be used to implement embodiments of the invention, but used merely for convenience in explaining this embodiment. Any known structure for

storing, housing, or otherwise supporting an object may be used in implementing

the various embodiments of the invention. For example, an RF switch 31 may either

cause the RF signal to bypass the gondola 70, and continue on through connection

80 a to gondola 71 (or through connection 80b), or the RF switch 31 may cause the RF

signal to feed into gondola 70. It is to be understood that the term "RF switch"

refers to any switch capable of transmitting a signal including, but not limited to,

RF, DC pulse communications, or voltage-level based communications (TTL, etc.)

signals. Furthermore, one or more additional RF switches 32 may route the RF

signal to a particular shelf, for example, through connections 61a, 61b, or 61c to

shelves 21a, 21b, or 21c upon gondola 70. In a preferred embodiment, a shelf

controller (e.g., controller 40a) may switch the RF signal to one or more of the

antenna boards 20 and then to antenna 10. It will be appreciated that while FIG. 2

shows three shelves on gondola 70, and eight antennae per shelf, any suitable

number of shelves and antennae per shelf may be used in accordance with preferred

embodiments of the invention. Furthermore, RF switch 32 can also switch the RF

signal to an individual antenna. For example, RF switch 32 can transport the RF

signal to antenna 11 (through connection 61d and antenna board 12).

[0037] In one embodiment, the use of RF switch 31 may result in an "insertion

loss." That is, some RF power may be lost as the signal passes through the switch. Thus, the level of RF power reaching gondola 71 and successive additional gondolas

may be less than the RF power reaching gondola 70. It is to be understood that the

term "RF power" refers to any power source capable of being used with the devices,

systems, and methods described herein including, but not limited to, RF, DC pulse

communications, or voltage-level based communication (TTL, etc.) power. In one

embodiment, however, the RF power may be approximately equal at each antenna

10. For example, it may be desired to set the RF power level at a given antenna 10

high enough to read all RFID tags attached to items resting on the given antenna 10,

but not so high as to read RFID tags attached to items resting on adjacent antennae.

RF attenuators can be used in accordance with preferred embodiments of the

invention to adjust and/or equalize the power level at each antenna 10. For

example, RF attenuators (not shown) could be placed between a shelf controller

(e.g., controller 40a) and each antenna 10 and used to regulate the RF power at each

gondola. It is to be understood that the term "RF attenuator" refers to any

attenuator capable of adjusting and/or equalizing the power level at each antenna

including, but not limited to, RF, DC pulse communications, or voltage-level based

communication (TTL, etc.) power. The RF attenuators may be chosen, for example,

to attenuate the RF power more at gondola 70 and less at gondola 71 and successive

additional gondolas. In one embodiment, RF attenuators may be placed at other

locations within the circuitry (e.g., in connections 61a, 61b, 61c, or between switches

31 and 32) to achieve the same result, as will be apparent to those skilled in the art. In another embodiment, a variable attenuator can be placed between the reader 50

and the switch 30 such that the power can be digitally controlled for each antenna

10. In another embodiment, the reader 50 may be capable of variable RF power

output. Placing an RF power detection circuit on the shelf controllers (e.g., RF

power detection circuit 41 located on controller 40a) permits control of the RF power

delivered to antenna 10.

[0038] In accordance with a preferred embodiment of the invention, a plurality

of antennae 10 optionally having associated antenna boards 20, shelf controllers 40a,

40b, 40c, gondola controllers 30, and associated wiring, may all be contained in or on

a physical structure, as shown, for example, in FIG. 2 as gondola 70 and gondola 71.

[0039] FIG. 3 illustrates an exemplary embodiment with the reader 50 being

controlled by a primary controller 100 that sends commands or control signals along

control cable 105 to select which antenna is active at any time. In one preferred

embodiment, the control signal is a digital signal. The term "digital signal" refers, in

one preferred embodiment, to any binary signal encoding data that can be

transported via any suitable carrier (e.g., CAN bus, RS-232, RS-485 serial protocols,

Ethernet protocols, Token Ring networking protocols, etc). Between gondolas (70,

71, etc.), the commands or control signals (e.g., digital signals) may be carried on

control cable 81a and 81b. Within a shelf, the commands or control signals may be

carried by cable or cables 35. The primary controller 100 may be a processing device (e.g., microprocessor, discrete logic circuit, application specific integrated circuit

(ASIC), programmable logic circuit, digital signal processor (DSP), etc.).

Furthermore, the shelves may also be configured with shelf controllers 40a, 40b, 40c,

and the gondola controller 30 with circuitry 34 for communicating with the primary

controller 100 to, for example, select antennae 10. The shelf controllers 40a, 40b, 40c

and gondola controllers 30 may also be microprocessors (or other processing

devices) with sufficient input/output control lines to control the RF switches

connected to their associated antennae.

[0040] In one preferred embodiment, primary controller 100 may selectively

operate any of the switches by sending commands (e.g., via digital signals)

containing a unique address associated with antenna 10 through, for example, a

digital data communication cable 105. The addresses could be transmitted through

the use of addressable switches (e.g., switches identical or functionally equivalent to

a Dallas Semiconductor DS2405 "1-Wire®" addressable switch). Each such

addressable switch, for example, provides a single output that may be used for

switching a single antenna. Preferably, the primary controller 100 may selectively

operate any or all the switches by utilizing one or more gondola controllers 30

and/or shelf controllers 40a, 40b, 40c. For example, these controllers may be a

processing device, which can provide multiple outputs for switching more than one

antenna (e.g., all the antennae 10 in proximity to the shelf controller 40a, 40b, 40c). The primary controller 100 may also be any processing device. Communications

between the primary controller 100 and the gondola controller 30, for example, can

be implemented by using communication signals in accordance with well known

communication protocols (e.g., CAN bus, RS-232, RS-485 serial protocols, Ethernet

protocols, Token Ring networking protocols, etc.). Likewise communications

between the gondola controller 30 and shelf controller 40a, 40b, 40c may be

implemented by the same or different communication protocols.

[0041] The term "intelligent station" generally refers to equipment, such as a

shelf, which may include controllers, switches and/or tuning circuitry, and/or

antennae. More than one intelligent station may be connected together and

connected to or incorporated with an RFID reader. A primary controller can be

used to run the RFID reader and the intelligent stations. The primary controller

itself may be controlled by application software residing on a computer. In one

embodiment, an "intelligent station" is an "intelligent shelf."

[0042] In a preferred embodiment, the intelligent shelf system is controlled

through an electronic network 120, as shown in FIG. 3. The network can include, for

example, the Internet, Ethernet, a local network, Controller Area Network (CAN),

serial, Local Area Network (LAN), Wide Area Network (WAN). A controlling

system that controls the intelligent shelf system will send command data to the

primary controller 100 via Ethernet, RS-232, or other signaling protocol. These commands include, but are not limited to, instructions for operating the RFID reader

unit 50 and switches associated with gondola controllers 30 and shelf controllers

40a, 40b, 40c. The primary controller 100 is programmed to interpret the commands

that are transmitted through the unit. If a command is intended for the reader unit

50, the primary controller 100 passes that command to the reader unit 50. Other

commands could be used for selecting antennae 10, and these commands will be

processed if necessary by primary controller 100 to determine what data should be

passed through digital data communication cable 105 to the gondola controllers 30

and, for example, on to the shelf controllers 40a, 40b, 40c.

[0043] Likewise, the shelf controllers 40a, 40b, 40c, and the gondola controllers 30

can transport data signals to the primary controller 100, as can the reader unit 50. In

one preferred embodiment, primary controller 100 transports result data back to the

controlling system through the electronic network 120. The inventory control

processing unit 130, shown in FIG.3, is one example of such a controlling system.

As discussed further herein with respect to the intelligent shelf system, the

electronic network and controlling system are used interchangeably to depict that

the intelligent shelf system may be controlled by the controlling system connected to

the intelligent shelf system through an electronic network 120.

[0044] Primary controller 100 of FIG. 3 can determine whether a command from

the electronic network 120 should be sent via a digital signal to reader 50, or should be sent through the communication cable 105. Primary controller 100 can relay data

it receives from the communication cable 105, and from reader unit 50, back to the

electronic network 120. In one preferred embodiment, the electronic network issues

a command to read one or more antennae. In this embodiment, the primary

controller 100 can send a digital signal to (a) set the proper switch or switches for

that antenna, (b) activate the reader, (c) receive data back from the reader, (d)

deactivate the reader, and (e) send the data back to the electronic network 120.

Further details of the processing of command signals from a host by the controller

can be found in U.S. Patent Application No. 10/338,892 (filed January 9, 2003), which

has been incorporated by reference in its entirety herein.

[0045] In a preferred embodiment, the primary controller 100 can be placed

between the electronic network 120 and the reader as shown, for example, in FIG. 3.

In this embodiment, a variety of reader types (e.g., readers 50) can be used as

needed. For example, the commands from the electronic network 120 to the

controller 100 may be transported using generic control data (e.g., not reader-

specific), thus allowing for expanded uses by various types of readers. In this

preferred embodiment, the electronic network 120 can send a "read antennae"

command to a controller 100. The controller 100 in turn can then translate this

command into the appropriate command syntax required by each reader unit 50.

Likewise, the controller 100 can also receive the response syntax from the reader unit 50 (which may differ based on the type of the reader unit), and parse it into a

generic response back to the electronic network 120. The command and response

syntax may differ for each type of reader unit 50, but the primary controller 100

makes this transparent to the electronic network 120.

[0046] In FIG. 3, a portion of the control cable 81a that extends beyond shelf 70,

and a portion of the RF cable 80a extends beyond shelf 70, are shown outside of the

shelf. However, as would be recognized by those skilled in the art, these extended

portions of the cables may also be contained within the shelf or another structure.

Additional extended control cable portions 81b and additional extended RF cable

portions 80b may be used to connect to more shelves or groups of shelves.

Likewise, additional shelves (not shown) may be added to groups of shelves, for

example, to gondolas 70 or 71 as would be apparent to those skilled in the art.

[0047] The item information data collected by the reader units 50 from each of

the intelligent shelves may be transmitted to an inventory control processing unit

130. The inventory control processing unit 130 is typically configured to receive

item information from the intelligent shelves. The inventory control processing unit

130 is typically connected to the intelligent shelves over an electronic network 120

and is also associated with an appropriate data store 140 that stores inventory

related data including reference tables and also program code and configuration

information relevant to inventory control or warehousing. The inventory control processing unit 130 is also programmed and configured to perform inventory-

control functions that are well known to those skilled in the art. For example, some

of the functions performed by an inventory control (or warehousing) unit include:

storing and tracking quantities of inventoried items on hand, daily movements or

sales of various items, tracking positions or locations of various items, etc.

[0048] In operation, the inventory control system would determine item

information from the intelligent shelves that are connected to the inventory control

processing unit 130 through an electronic network 120. In one preferred

embodiment, one or more intelligent shelves are controlled by inventory control

processing unit 130. Inventory control processing unit 130 can determine when the

reader units 50 are under control of primary controller 100 and poll the antennae 10

to obtain item inventory information. In an alternate embodiment, the controller(s)

100 may be programmed to periodically poll the connected multiple antennae for

item information and then transmit the determined item information to the

inventory control processing unit 130 using a reverse "push" model of data

transmission. In a further embodiment, the polling and data transmission of item

information by the primary controller 100 may be event driven, for example,

triggered by a periodic replenishment of inventoried items on the intelligent shelves.

In each case, the primary controller 100 would selectively energize the multiple antennae connected to reader 50 to determine item information from the RFID tags

associated with the items to be inventoried.

[0049] Once the item information is received from the reader units 50 of the

intelligent shelves, the inventory control processing unit 130 processes the received

item information using, for example, programmed logic, code, and data at the

inventory control processing unit 130 and at the associated data store 140. The

processed item information is then typically stored at the data store 140 for future

use in the inventory control system and method of the invention.

[0050] FIG .4 illustrates an exemplary embodiment, showing parts of the system

that connect to several gondola controllers 30, 30b, 30c, 3Od, 3Oe, and 3Of. Other

parts of a system that may be associated with a gondola 70, 71, as shown in FIG. 3,

for simplicity are not repeated in FIG. 4 (or if repeated, are not described where the

structural and functional aspects are substantially the same as in FIG. 3). FIG. 4

illustrates how an RFID reader 50 may send RF signals along connection 45 to

gondola controller 30 and how the RF signals may then be directed to additional

gondola controllers along connections 80a, 80b, 80c, 8Od, 8Oe, and 8Of. Likewise

primary controller 100 may send commands or control signals along cable 105 to

gondola controller 30, and from there on to additional gondola controllers through

connections 81a, 81b, 81c, 81d, 81e, and 81f. In a preferred embodiment, the

command or control signals (e.g., digital signals) can select a communication route for sending an RF signal (e.g., from RFID reader 50 to connection 61c through

switches 31 and 32).

[0051] FIG. 5 illustrates an exemplary embodiment, showing parts of the system

that connect to several gondola controllers 30, 30b, 30c, 3Od, 3Oe, and 3Of. Other

parts of a system that may be associated with a gondola, as shown in FIG. 3 or FIG.

4, for simplicity are not repeated in FIG. 5 (or if repeated, are not described where

the structural and functional aspects are the same as in FIG.3 or 4). FIG. 5 illustrates

how a second RFID reader 51 can send RF signals along connection 46 to gondola

controller 3Od and how the RF signals may then be directed to additional gondola

controllers along connections 8Od, 8Oe, and 8Of. Likewise another primary controller

101 may send commands or control signals along cable 106 to gondola controller

3Od, and from there on to additional gondola controllers through connections 81d,

81e, and 81f. In another preferred embodiment, using more than one controller 100,

101 or RFID reader 50, 51 may improve reliability and speed.

[0052] The architecture of the Internet is an example of technology where digital

data traveling between two computers is typically routed along a path that may

pass through several intervening computers (also known as routers). Furthermore

the path may change from time to time, or even during a single transmission.

Routing methods have been developed to control the data path so that orderly and

simultaneous transmissions may occur between multiple computers. Some of the routing methods that may be used include distance-vector types such as RIP

(Routing Information Protocol) and (Cisco's) IGRP (Interior Gateway Routing

Protocol), and link-state methods such as OSPF (Open Shortest Path First) and

(Cisco's) EIGRP (Enhanced Interior Gateway Routing protocol). These routing

methods are well known and are used as examples only, but the concept of a router

is not limited by the routing method used to choose the data path.

[0053] While the concept of a digital data router is known, one preferred

embodiment of the invention is directed to a combination router that routes both RF

and digital signals. The router, in one embodiment, can transport an RF signal from

an RFID reader 50, 51 along one or more paths to a particular antenna or group of

antennae. Such an RF router may be used, for example, to provide redundancy or

backup capability for the RF signal paths. In another preferred embodiment, the

router is capable of transporting command or control signals (e.g., digital data)

between a primary controller 100, 101 and an antenna or antennae 10. In yet

another embodiment, a switching system is provided for selecting communication

routes (e.g., predetermined data pathways and through predetermined nodes or

routers) for RF signals (e.g., between an RFID reader and antenna(e)) and for data

signals. In this embodiment, the RF signals and data signals can be transported

along an RF pathway following substantially the same communication route as the

pathway for digital signals. In one preferred embodiment, the communication routes for RF signals and for digital signals are different. In order to determine

which pathways are available for RF signals, in one embodiment the combination

router may communicate RF or non-RF "neighbor query" signals over the available

RF pathways. By using neighbor query signals, each combination router may

determine which other combination routers or other devices are connected to the

combination router, and the system may then determine all available RF pathways.

[0054] FIG. 6 illustrates an exemplary combination router 600 for RF signals as

well as command or control signals in accordance with a preferred embodiment of

the invention. Additional description of such a router can be found in U.S. Patent

Application No. 60/657,709, which has been incorporated by reference herein in its

entirety. Preferably, the combination router 600 may comprise one or more logical

units 605 that cooperate with a data router 610, and an RF router 650. It should be

understood that such an exemplary combination router can comprise any suitable

number of logical units 605, data routers 610 and RF routers 650. In an exemplary

embodiment, the data router 610 and RF router 650 are located proximate to one

another, for example, within combination router 600. For simplicity in the following

discussion, one or more data routers such as 610 may be designated "D", and one or

more RF routers such as 650 may be designated "R". Furthermore for simplicity,

logical units 605 with a combination router may be omitted from some drawings.

Data router 610 may operate according to established routing methods such as RIP, OSPF, or any other routing method. In this example data router 610 has multiple

ports that each may have bidirectional capabilities. For illustrative purposes, two

such ports have been labeled as inputs 611 and 612, although more or fewer inputs

may be used. Other ports have been labeled as outputs 621, 622, 623, and 624,

although more or fewer outputs may be used. RF router 650 may operate such that

the RF signals follow essentially the same routes as the data signals, or RF router 650

may send RF signals along routes that are similar or even different from the data

signals. In this example, RF router 650 has two inputs 631 and 632 and four outputs

641, 642, 643, and 644, although more or fewer inputs and outputs may be used. It is

understood the terms "input" and "output" are used for convenience herein, and

that RF and data communications may take place in either direction. For example,

data signals and RF signals can be transported from a controller and an RF antenna

respectively through the "outputs" of the combination router and out the "inputs"

to their destination (e.g., a primary controller 100, 101 and an RFID reader 50, 51,

respectively). In addition, devices (e.g., reader) which may be connected in some

portions of the network to an "input" port may be attached to an "output" port

without limiting the functionality or capabilities of the devices in the system or the

configuration of the system. Similarly, other devices (e.g., antenna) which may be

connected in some portions of the network to an "output" port may be attached to

an "input" port without limiting the functionality or capabilities of the devices in the

system or the configuration of the system. [0055] Data router 610 may be a "router" such as is used on the Internet or on

other digital networks, or it may be any device which accomplishes the task of

routing digital data. It is well known that digital data may be divided into

"packets" for transmission over networks. In passing through a data router 610, the

data may temporarily be placed in local memory while data switching is being done.

"Switching" may occur such that data received through an "input" is then routed to

one or more "outputs/' or back out a second "input." However, for explanation

purposes here it will be assumed that data is received in one input and are routed to

one output.

[0056] In one preferred embodiment, RF router 650 is configured so that one

input is routed to one and only one output, although a plurality of switching

devices may be provided to switch individual signals. FIG. 7 A shows an example

where an RF signal entering on input connection 631 is routed through RF switch

6510 to output connection 643. Also, an RF signal entering on input connection 632

is routed through RF switch 6520 to output connection 641. In FIG. 7B, the diagram

is simplified by the use of a crossover ("X") 6530 to denote the RF path, without

showing the details of RF switches 6510 and 6520. The RF switches 6510, 6520, 6530

may include any number and type of devices capable of switching an RF signal, for

example, PIN diodes or other RF switching devices. [0057] FIG. 8 illustrates an exemplary system for routing data and RF signals in

accordance with a preferred embodiment of the invention. An electronic network

120 may be used with connection 121 to a primary controller 100, and an RFID

reader 50 may be connected to primary controller 100. One or more additional

primary controllers may be used, such as primary controller 101 (connected to the

electronic network 120 through connection 122 and having an RFID reader 51

connected. As described herein, the readers 50, 51 may be controlled by the primary

controllers 100, 101. One or more combination routers 600, 601, 602, etc. may be

provided to route data and RF signals. For example, primary controller 100 may be

connected via connection 105 to a data input on the data ("D") part of combination

router 600, and may also be connected to a data input on the data ("O") part of

another combination router 601. Also, for example, RFID reader 50 may be

connected via connection 45 to an RF input on the RF ("R") part of combination

router 600, and may also be connected to an RF input on the RF ("R") part of

another combination router 601. Each combination router 600, 601, 602, etc. can

comprise any suitable number of logical units 605, data routers 610, and RF routers

650.

[0058] Similarly, additional primary controller 101 may be connected via

connection 106 to a data input on the data ("D") router of combination router 600,

and may also be connected to a data input on the data ("D") router of another combination router 601. Also for example, RFID reader 51 may be connected via

connection 46 to an RF input on the RF ("R") router of combination router 600, and

may also be connected to an RF input on the RF ("R") router of another combination

router 601 via connection 46. The data inputs 105 and 106 are understood to be

connected to different inputs on the combination routers, as are the RF inputs 45

and 46.

[0059] Additional combination routers may be provided, such as combination

router 602. Further, the combination routers may be connected to other

combination routers (such as the output of combination router 600 being connected

to the input of combination router 602). Further the combination routers may be

connected to other devices such as antenna systems 651, 652, 653, 654, and 655.

Furthermore, as taught herein, other devices connected to the combination router

may connect to additional devices.

[0060] FIG. 8 further illustrates several preferred embodiments with alternate

connection options. For example, combination router 600 can be configured with

switch paths "a" connected and switch paths "c" disconnected and with

combination router 601 configured with switch paths "b" connected and with switch

paths "ά" disconnected. In this illustration, the data signals from primary controller

100 and the RF signals from RFID reader 50 are routed through connected switch

paths "b" in combination router 601 to antenna system 655, while the data signals from primary controller 101 and the RF signals from RFID reader 51 are routed

through connected switch paths "a" in combination router 600 to antenna system

651.

# [0061] In another example (not illustrated), combination router 600 may be

configured with switch paths "c" connected, and switch paths "a" disconnected and

combination router 601 is configured with switch paths "ά" connected and with

switch paths "b" disconnected. Further, for example, combination router 602 may

be configured with switch paths "e" and "F connected and with switch paths "g"

disconnected. In this case, the data signals from primary controller 100 and the RF

signals from RFID reader 50 are routed through switch paths "c" and "i" to antenna

system 654, while the data signals from primary controller 101 and the RF signals

from RFID reader 51 are routed through switch paths "d" and "e" to antenna

system 653.

[0062] Not all available (or possible number of) switch pathways are illustrated

in FIG. 8. As shown previously as an example in FIG. 7 A, each of the two data

signals input to a combination router 600, 601, 602 may be sent along any one of the

four exemplary through paths, or along no path at all. Any number of paths and/or

ports may be used. Likewise each of the two RF signals input to a combination

router 600, 601, 602 may be sent along any one of four through paths, or along no

path at all. Preferably, a data signal and its associated RF signal (e.g., data signal along connection 105 and RF signal along connection 45) will follow a path through

the same combination routers. It is therefore possible using the system illustrated in

FIG. 8 to have primary controller 100 and its associated RFID reader 50

communicate with any of the antenna systems (e.g., 651, 652, 653, 654, 655).

Likewise primary controller 101 and its associated RFID reader 51 may

communicate with any of the antenna systems.

[0063] In an illustrated operation of the exemplary embodiment represented by

the system of FIG.8, the electronic network 120 may provide a command to read

antenna system 654. The system may then determine a method to read the desired

antenna system 654. Methods of routing such as the RIP method and the OSPF

method (or other methods) may be utilized to determine a path for digital data

between the electronic network 120 and antenna system 654. As an example, the

logical unit 605 (FIG. 6) within each combination router 600, 601, 602 may

communicate with other combination routers 600, 601, 602 and with the primary

controllers 100, 101 and electronic network 120 to establish a suitable data path.

Parameters such as the operating readiness of the combination routers 600, 601, 602

may be considered by the system in determining a suitable data path. When a

suitable data path has been established through one or more combination routers

600, 601, 602, the RF path may be set along a path through the same combination

routers 600, 601, 602, or additional parameters such as the operating readiness of RF switching components may be considered to determine if the proposed route would

be suitable for the RF path. In accordance with a preferred embodiment, the

primary controller 100, 101 may be configured to establish the data path using

known routing methods such as OSPF or RIP. In a preferred embodiment, the

electronic network 120 may also have some intelligence, for example, to send control

messages to the primary controller 100, 101 to assist in setting up the path.

[0064] If no data path can be determined, an alternate pathway can be

determined. For example, as an alternative the RF operational readiness parameters

may be considered as factors in the initial pathway selection algorithm or other

methodology utilized by the primary controller 100, 101.

[0065] It should be noted that additional devices may be attached to the

exemplary system shown in FIG. 8. For example, a device such as gondola

controller 630 (as previously described) may be connected to one of the outputs of

combination router 602. When an appropriate pathway (not shown but designated

"g") is provided, digital data may be provided to gondola controller 630, and may

continue to other devices along connection 681. Likewise, RF signals may be

connected to gondola controller 630, and may continue to other devices along

connection 680. The other devices may include other gondola controllers or other

combination controllers. [0066] In a preferred embodiment, one or more system components (e.g.,

combination router 600, 601, 602) may include circuitry to determine the operation

(e.g., the RF power, active status, fault status, etc.) at one or more devices (e.g.,

readers) at various locations in the system. The RF power of such devices (e.g., of a

reader), for example, in accordance with a preferred embodiment of the invention,

can be adjusted or attenuated so that a desired power level is obtained at the

component (e.g., combination router 600, 601, 602, a particular one or more antennae

10, etc.). In a preferred embodiment, the system component (e.g., combination

router 600, 601, 602) may also comprise circuitry to measure the Voltage Standing

Wave Ratio (VSWR) when a particular antenna is selected, in order to gain

information about the antenna or the RF connection between the router and the

antenna. Ideally, the VSWR is 1.0, but it can be greater than 1.0 if the antenna is

disconnected or is not optimally tuned. In accordance with a preferred

embodiment, the system may use the VSWR information measured by the

component to provide alerts about suboptimal operation, or to cause the antenna

tuning to be adjusted, for example, through variable tuning components such as

varactors (voltage controlled capacitors).

[0067] FIG. 9 shows a flowchart illustrating an exemplary method of operating a

system using combination routers 600, 601, 602 in accordance with a preferred

embodiment. For exemplary purposes only, the path described is from the electronic network 120 through RF reader 50 and/or primary controller 100, to

antenna system 653. In step 900, the combination routers 600, 601, 602 may perform

a self -check and determine their status. Such a self-check could comprise an

integrity check (e.g., a determination of which input and output ports on data router

610 were functional or were connected to or in communication with other devices as

is well known in the art). The combination routers 600, 601, 602 as described

previously may contain a logic unit 605 that may be a microcomputer device

programmed to routinely perform integrity checks and communicate their status to

other devices.

[0068] In addition to the integrity checks, the combination routers 600, 601, 602

may also check the integrity of the RF router 650 in accordance with an embodiment

of the invention. Such an integrity check may, for example, determine whether the

RF switches (e.g., RF switches 6510, 6520, 6530) are functioning properly through a

test or from recent logged data. These checks may also include determining the

type of device that is connected to the output ports (e.g., antenna 10, router 602, RF

switches 6510, 6520, etc.). The diagnostics can also determine if the antennae 10

connected to the device are within operational parameters.

[0069] In step 905, the combination router 600 may communicate its status to

other components of the system (e.g., combination routers 601, 602, electronic

network 120, etc.). The combination routers 600, 601, 602 and/or the electronic network 120 may then store the status information for use in determining available

routes for data and RF signals.

[0070] In step 910, the next antenna 10 to be read is determined from, for

example, a table, an ordered list, a priority queue, a schedule, a user input, other

factors, or a combination of some or all factors.

[0071] In step 915, the available routes by which a reader 50 and/or primary

controller 100 may communicate with the desired antenna system 653 are

determined by a variety of factors (e.g., the stored status information, recent history

such as the outcome of earlier attempts to communicate with the desired antenna 10,

etc.).

[0072] In step 920, if applicable, a data route may be selected from the available

data routes. (If not applicable, flow advances to step 940.) Such selection may be

based on criteria such as a routing method, for example, RIP or OSPF, or on other

criteria suitable for determining a data route.

[0073] In step 925, a data connection may be established between a primary

controller 100 and the desired antenna 10. For example, the data connection may be

established by causing the appropriate data switches (not shown) to be set in one or

more combination routers 600, 601, 602. [0074] In step 930, that the data connection has been established may be verified

between the primary controller 100 and the desired antenna 10. This verification

could, for example, be by a "handshake" communication between the primary

controller 100 and the antenna system 653.

[0075] In step 935, the acceptability of the data connection may be decided. If the

data connect is not acceptable, the flow returns to step 920 to select an alternate data

route. If the data connection is acceptable, the flow next moves to step 940.

[0076] In step 940, an available RF route may be selected. Preferably, this route

will be through the same combination routers 600, 601, 602 as the data connection.

Thus the data routing method (augmented by RF integrity checks in step 900) may

be used to select the RF route as well.

[0077] In step 945, the appropriate RF switches 6510, 6520, 6530 maybe set in one

or more combination routers 600, 601, 602 in order to provide an RF connection

between the RFID reader 50 and the antenna system 653.

[0078] In step 950, that the RF connection has been established may be verified

between the RFID reader 50 and the desired antenna 10. This verification could, for

example, be by a confirmation from the combination router(s) 600, 601, 602 that the

appropriate RF switch(es) 6510, 6520, 6530 had been set, or could be, as another example, through a VSWR check to ensure the RF connection is operating within

allowable limits.

[0079] In step 955, the acceptability of the RF connection is decided. If the RF

connection is not acceptable, the flow returns to step 940 to select an alternate RF

route. Alternately, the flow may return to step 920 and select a different data route.

If the RF connection is acceptable, the flow moves to step 960.

[0080] In step 960, the RFID reader 50 is turned on, if it has been off or on

standby during the previous operations. Having the RFID reader 50 off or on

standby may save power, reduce extraneous RF transmissions, and prevent damage

to RF switches 6510, 6520, 6530 during state changes.

[0081] In step 965, the RFID tags (e.g. RFID tag 9) are read (e.g., by the connected

antenna system 653).

[0082] In step 970, any data obtained from the RFID tags 9 may be stored.

[0083] In step 975, the RFID reader 50 may be turned off (or placed on standby).

[0084] In step 980, the time for status updates is determined. If it is time for a

status update, the flow may return to step 900 and continue from there. Alternately,

the combination routers 600, 601, 602 independently may continuously or

periodically check status per steps 900-905. If a status check is not needed, or after a status check is performed, the flow continues in step 910 by determining which

antenna 10 to read next.

[0085] In accordance with a preferred embodiment of the invention, an

intelligent network may be implemented to facilitate transportation of signals. In an

RFID-based system, for example, where RFID signals are to be transported, such an

intelligent network may be used to manage the transportation of RFID signals to

and from RFID-enabled devices. Preferably, the intelligent network employs one or

more manager units used to manage the network. The manager units may

incorporate one or more microprocessors or other processing devices used to

execute the operations described herein. In particular, the manager units control the

network processing of signals over the network and coordinate the

inclusion/exclusion of devices on the network.

[0086] In accordance with a preferred embodiment, the intelligent network

further includes one or more network devices that use the signals transported over

the network or facilitate transportation of such signals. The network devices may

include one or more combination routers and/or combination switches, as described

above, that have the capability of processing and facilitating the transporting of both

RF data and digital data signals. Like the manager unit, the network devices may

incorporate one or more microprocessors or other processing devices to execute the

operations described herein. The network devices may further include RFID readers used to read RFID-enabled devices, as well as RFID reader/writer pads used

to read and write RFID-enabled devices.

[0087] In accordance with a preferred embodiment, the intelligent network

operates to automatically and dynamically reconfigure its network topology as

network devices are included or excluded during operation. Preferably, when any

network device attempts to be added to the intelligent network, its presence in the

network is detected by the manager unit. In a preferred embodiment, for example, a

new network device when activated on the intelligent network may issue a

notification to the manager unit (directly or through other network devices). The

manager unit upon receiving the notification reconfigures its map of the network

topology.

[0088] In accordance with a preferred embodiment, a new network device may

also be detected by its neighboring network devices. Neighboring network devices

may detect the notification sent by the new network device and alert the manager

unit of the location of the new network device. In accordance with a preferred

embodiment of the invention, neighboring network devices detect each other

preferably by detecting and exchanging information over the same line for which RF

signals will travel. This alert causes the manager unit to be alerted of the new

network device, the RF topology and other aspects of the network, and allows the

manager unit to reconfigure its map of the network topology. [0089] By continuously maintaining and reconfiguring a network topology, the

manager unit is able to more efficiently set up and control the paths of the RF and

digital data signals that are transported through the network from one network

device to another.

[0090] In accordance with a preferred embodiment of the invention, the system

provides information regarding one or more network devices (e.g., reader, antenna,

etc.) or their ports to determine their status (e.g., fault), characteristics (e.g., power

level), etc. The information may be provided by the network devices themselves,

neighboring network devices, or other devices (e.g., sensors) located throughout the

network. Based on such information one or more components (e.g., manager unit)

may be designated to control the operation of the devices (or the routing of

information to such devices) to facilitate ultimate operation of the network.

EXAMPLES

[0091] The following descriptions of FIGs. 10-25 illustrate exemplary

implementations of preferred embodiments of the invention as applied to an RFID-

enabled system.

[0092] INTELLINETWORK™

[0093] The intelligent network in accordance with a preferred embodiment of the

invention may be implemented using a network known, in this example, as "IntelliNetwork™," which is a flexible and scalable network of intelligent devices

that provide RF signal routing and switching. The names used herein are for

exemplary purposes only. An exemplary use of the IntelliNetwork™ is for building

RFID systems. One or more RFID readers may be connected into an RF

communication network comprising the intelligent devices connected together by

RF communication means (for example coaxial cable). RFID signals may thus be

communicated from the RFID reader, through the IntelliNetwork™, to one or more

antennae. The intelligent devices (or "IntelliDevices™") themselves, besides helping

convey the RF signal, also are connected together by a digital data network used for

controlling and monitoring the IntelliDevices™.

[0094] The intelligent devices include IntelliRouters™, IntelliSwitches™, and

IntelliPads™. These devices will be described first, followed by the

IntelliManager™ software that controls the intelligent devices.

[0095] Preferably, the IntelliNetwork™ devices have several capabilities for

facilitating their management and use in a network environment. They may use

DHCP Client implementation, that is, the Dynamic Host Configuration Protocol, an

Internet protocol for automating the configuration of computers that use TCP/IP

communications. They may use SNMP (Simple Network Management Protocol),

which has become a de facto standard for Internet work management. The

intelligent devices may use DHCP tags, a standard method of communicating certain operating instructions with DHCP. They may also support UART (universal

asynchronous receiver-transmitter) communication preferably through the RF

connections to discover from neighbor devices the MAC (Media Access Control)

address, a standardized hardware address that uniquely identifies each node of a

network, usually being assigned specifically to the NIC (network device such as a

network interface card) of the device.

[0096] When an intelligent device is powered up, its operating system boots a

network device, acquires a DHCP IP address, and automatically configures its

internal subnet by DHCP and Autosubnet services provided by the

IntelliManager™. The devices register themselves automatically by sending an

SNMP cold boot notification to the IntelliManager™, so the IntelliManager™ may

identify and query the device, obtaining from it information about the network

topology that may be displayed on-screen for the user to view, and may be used for

setting up RF pathways between readers and antennae.

[0097] For network operations, the intelligent devices, particularly the

IntelliRouter™, may support Subnet Masking and a routing protocol such as RIP

(Routing Information Protocol), OSPF (Open Shortest Path First), IGRP (Interior

Gateway Routing Protocol), EIGRP (Enhanced Interior Gateway Routing Protocol),

or any other routing protocol.

[0098] BOOT-UP AND AUTODISCOVERY OF INTELLIDEVICES™ [0099] FIG. 10 illustrates how, communicating using a standard protocol server

such as DHCP Server 1000, a group of intelligent devices boot up after being

plugged in, connected to the network, and switched on. Each of the intelligent

devices acquires a network Internet Protocol address from the DHCP server 1000.

The intelligent devices include an IntelliRouter™ 1 (1001) at a first level, connected

to additional IntelliRouters™ 2 and 3 (1002 and 1003) at a second level.

Furthermore IntelliRouter™ 2 is connected to a series of three IntelliSwitches™

(1011, 1012, 1013). During this initial IP address acquisition, IntelliManager™ 1020

does not yet have any information about the intelligent devices, so its network map

1025 is blank. As an example, LAN subnets may be allocated to IntelliRouter™

LAN ports.

[00100] FIG. 11 illustrates how the intelligent devices each attempt to

communicate through each of their RF connections (RF input ports and RF output

ports). If any other IntelliDevices™ are connected to these ports, then each

IntelliDevice™ sends its MAC address to nearby IntelliDevices™, allowing them to

discover what IntelliDevices™ they are connected to on the RF network. For

example, IntelliRouters™ 1 and 2 (1001 and 1002) swap their MAC addresses, as do

all other devices that are interconnected through RF ports. [00101] FIG. 12 illustrates how the IntelliDevices™ each send a 'cold boof

SNMP message to the data network to announce their existence to IntelliManager™

1020, and to announce that they are ready to be queried.

[00102] The IntelliManager™ picks up the MAC addresses from the cold

boot messages, and creates objects inside the Object Manager to represent the

devices. IntelliManager™ stores a list of devices from which it received

announcements. The IntelliManager™ list of devices 1025 now contains list objects

1001a, 1002a, 1003a (representing the IntelliRouters™) and list objects 1011a, 1012a,

and 1013a (representing the IntelliS witches™).

[00103] FIG. 13 illustrates how the IntelliManager™ sends a query to each

device to get the network topology (neighboring device) information. Each device

in turn responds with information about what MAC addresses are connected to its

RF ports. The IntelliManager™ builds a representation 1025 of the network

topology using the information it receives from the IntelliDevice™ queries. Thus

representation 1025 is identical to the RF topology of the IntelliNetwork™. The

representation is then used by IntelliManager™ for RF network route planning.

[00104] INTELLIROUTER™

[00105] FIG. 14 is a simplified block diagram of an exemplary

IntelliRouter™ 1050. An IntelliRouter™ is a combination digital data router and RF signal router, or combination router, as described previously herein. The

IntelliRouter™ includes a microcontroller 1055, and may be controlled from outside

for example by a computer such as a workstation or server, communicating to the

IntelliRouter™ by a digital data network comprised of wired or wireless means,

such as a standard LAN, MAN, or WAN. Communication may be over the Internet.

The IntelliRouter™ may communicate digital data in turn to additional

IntelliRouters™ or IntelliSwitches™, or these additional devices may communicate

separately via the digital data network. In the example shown, the IntelliRouter™

has a digital communication capability 1060 with an input DO and four outputs Dl-

D4. "Input" and "output" are used for convenience in describing the

IntelliRouter™; normally D0-D4 may all be bidirectional. It is understood that any

suitable number of ports can be used in accordance with preferred embodiments of

the invention.

[00106] The IntelliRouter™ is capable of automatic setup using standard

DHCP protocols and uses a specialized algorithm for address allocation. It can

route digital data as network data packets. It uses SNMP as its main command and

control language. It supports network communications to IntelliSwitches™ as well

as additional IntelliRouters™, or other devices. It is capable of receiving data

packets from the IntelliManager™ and routing them in TCP/IP or other serial data

formats to an RFID reader, for instance if the RFID reader does not itself support network communications. The IntelliRouter™ has a switch that can be activated

manually to send a signal to the IntelliManager™, identifying the particular

IntelliRouter™ so that it may be highlighted on a configuration table or graphic to

help with field setup or troubleshooting. The IntelliRouter™ monitors itself and its

RF signals or connections, and forwards status and diagnostic information to the

IntelliManager™.

[00107] One of the capabilities of an IntelliRouter™ is its support for the

creation and destruction of RF paths through the IntelliRouter™, which is usually

used within a network of IntelliRouters™ and IntelliSwitch.es™. For example,

IntelliRouter™ 1050 has one RF input port RO and four RF output ports R1-R4. The

terms "input" and "output" are used in convenience in describing the

IntelliRouter™. In a preferred embodiment, R0-R4 may all be bidirectional. RF

switching circuitry is provided as shown by the exemplary block 1065, which is

meant to be symbolic and not limiting as to the switch circuitry design. The

switching circuitry 1065 is under control of microcontroller 1050, which typically

follows commands from the IntelliManager™.

[00108] The IntelliRouter™ supports neighbor-to-neighbor identification

over the RF path through ports R0-R4. The IntelliRouter™ exchanges MAC address

(or other form of unique identification) information with its neighbors over the RF paths, and then sends this information to the IntelliManager™ which can construct a

map of the RF network.

[00109] Each of the IntelliRouter™ outputs may be connected to another

IntelliRouter™ or IntelliS witch™, or may be connected directly to an RFID antenna.

The IntelliRouter™ may have circuitry 1070 for measuring the tuning characteristics

of RF ports to determine whether an output port should be utilized (i.e. it will not be

used if nothing is connected, or if tuning characteristics are outside defined

parameters).

[00110] The circuitry 1070 may also measure RF power being applied to an

RF antenna port, enabling diagnostics to be performed automatically by the

IntelliDevice™ or by the IntelliManager™ software. This also enables the

IntelliManager™ to adjust the RF power to an appropriate level, for example by

sending a command to an RFID reader. The IntelliRouter™ may have additional

circuitry (not shown) for measuring such variables as temperature, voltage, current,

etc., and capability to report such measurements to the IntelliManager™.

[00111] The IntelliRouter™ may also deliver DC power (for example, 300

milliamps at +12V (not shown)) through the RF output ports when instructed to do

so by the IntelliManager™ software. This current, for example, may be used to

drive circuitry connected to the antenna. [00112] For a typical IntelliRouter™ 1050, the digital communication block

1060 may have one (typically) or more WAN (Wide area network, such as Internet)

ports, several (typically four) LAN (Local area network) ports (for connecting to

other IntelliRouters™ or IntelliS witches™), one or more RF Input ports RO (typically

two), several (typically four) RF output ports R1-R4, as well as (not shown) RS232,

PS/2, parallel, USB, or other IO ports, and ports for input and output power (with

the output power being controlled on demand by the IntelliManager™).

[00113] For example, an RFID reader (not shown) may be connected to an

IntelliRouter™ input port such as RO, and an antenna (not shown) may be connected

to one of its output ports such as R2. However, between the RFID reader and the RF

input port RO, or between the RF output port R2 and the antenna, there may be

additional IntelliRouters™ and/or IntelliSwitches™. When a given reader is to be

connected to a given antenna, the IntelliManager™ route manager passes out

instructions to each router and switch on the network via SNMP to create a path for

the RF to follow from reader to antenna. As a node on the IntelliNetwork™, each

router receives its own individual internal switching commands for its own RF

switching circuitry 1065 to correctly set the node on the RF Path. Some of the

IntelliRouter™ multiple RF input and output ports R0-R4 may serve either as inputs

or outputs. [00114] The router may send out SNMP messages to the IntelliManager™

about the general status of the IntelliRouter™. These messages may, for example,

include the following types.

[00115] A switch notification when a pushbutton is pressed, to send a

message to the IntelliManager™, which may then highlight this device on the GUI

network map for use during installations or diagnostics.

[00116] A critical voltage notification, sent if the IntelliRouter™ power

supply exceeds minimum or maximum limits. The IntelliManager™ is able to set

these limits, and to provide a graphical display of any devices out of limits.

[00117] An external power supply error notification, sent if the routers'

external power supply has a problem (too much current, too little current, etc.). The

IntelliRouter™ also supplies power to connected devices such as readers. It may

also monitor the power connections to other devices for voltage, current, and other

conditions, and can send error notifications to the IntelliManager™ if a malfunction

is detected in the power connection or supply.

[00118] A temperature alarm, if the maximum allowed temperature has

been reached.

[00119] An RF output fault notification, when there is an RF signal

problem. [00120] An output port disconnected notification, when an output port

state is changed from connected to disconnected.

[00121] A VSWR limit notification, when an RF port has exceeded the high

or low VSWR limit.

[00122] A neighbor device output port change notification, when the RF

output port neighbor has changed. The IntelliManager™ indicates if the neighbor

MAC address is changed or the neighbor device is disconnected.

[00123] A neighbor device input port change notification, when the RF

input port neighbor has changed. The IntelliManager™ indicates if the neighbor

MAC address is changed or the neighbor device is disconnected.

[00124] The IntelliRouter™ has the ability to query other RF network

devices immediately connected to it. It does this by passing preferably over the RF

cable its own MAC address and or the MAC address of the neighbor device.

[00125] When a device is connected or removed, it sends an alert to the

IntelliManager™ so that the network topology map can be automatically updated.

[00126] INTELLISWITCBF M

[00127] FIG. 15 is a simplified block diagram of an exemplary

IntelliSwitch™ 1100. The design, capabilities, and operation of the IntelliSwitch™ are in most respects similar to those of the IntelliRouter™. The IntelliS witch™

includes a microcontroller 1105, and combines a digital data capability 1110, and RF

data switching capability 1115. It may include RF measurement capability 1120.

Typically the RF switching may "bypass" the RF signal onto additional

IntelliSwitches™ in a daisy-chain fashion, for example connecting RF input port RO

to RF bypass port Rx, or may connect the RF power to one of several RF antennae

connected to the IntelliS witch™, for example connecting RF input port RO to RF

output port R5. Its RF ports are typically one input port RO, one bypass port Rx, and

sixteen output or "antenna" ports, shown in this example as ports R1-R8 for

simplicity. The invention is not meant to be limited to sixteen ports, but may have

fewer or more as appropriate. For example, thirty-two ports may be used.

However, the bypass port Rx could lead instead to another IntelliRouter™, and one

or more of the output ports R1-R8 could be connected to another IntelliRouter™ or

IntelliSwitch™.

[00128] INTELLIPAD™

[00129] FIG. 16 shows a simplified block diagram of an exemplary

IntelliPad™ 1150. An IntelliPad™ may be considered an alternative version of the

low profile pad described in previous U.S. Provisional Patent Application No.

60/466,760, which is incorporated herein by reference in its entirety. An IntelliPad™ may share many of the configuration capabilities of the IntelliRouter™ and

IntelliSwitch™, including a microcontroller 1155, digital communications capability

1160, and RF measurement circuitry 1170. The IntelliPad™ also contains one or

more antennae, for instance a High Frequency antenna, represented by loop antenna

1180, and an Ultra High Frequency antenna, represented by patch antenna 1190).

Thus the IntelliPad™ may be used for reading and writing RFID tags. The

IntelliPad™ shown in FIG. 16 includes an HF input port (RH) and an UHF input

port (RU) which are connectable to external readers (not shown). The IntelliPad™

may also measure the power/current levels, etc. as other devices can.

[00130] The IntelliPad™ can be connected to the IntelliNetwork™ (or an

IntelliManager™ or other controller) for control, to an RF reader, and to a barcode

scanner gun. The user may read and/or write EPC and barcode information to and

from RFID tags that are placed on the IntelliPad™ or scanned via the scanner gun.

[00131] The IntelliPad™ is designed to handle "hands-on" work, such as

passing RFID tags over the pad surface to perform various inventory management

functions. The IntelliPad™ is preferably read on demand when a user places an

item on it. Therefore, a reader may be dedicated to the IntelliPad™, or shared by a

few IntelliPads™, or the IntelliPad™ may incorporate interrupt-driven events to

cause a "read-on-demand." IntelliPad™ transactions include an event notification is raised whenever the user triggers a barcode scanner attached to the IntelliPad™,

and a read-on-demand in response to the event notification.

[00132] SENSORS

[00133] The intelligent devices, as described previously, may have sensors

(1070, 1120, 1170) for use in determining RF power and allowing control of the RF

power remotely, measuring RF transmitted power and/or RF reflected power for

determining system connectivity, performance, and tuning measurements, to be

used to remotely tune components or to make decisions whether a circuit or an

antenna should be used. Centralized RF signal power management is a part of the

IntelliNetwork™, allowing antennae at different distances from a reader to still have

equal or otherwise optimized power.

[00134] The IntelliDevices™ may also have temperature measurement

sensors, for example to monitor the proper operation of the IntelliDevice™. Voltage

and current measurement sensors may likewise be provided to monitor proper

operation of various circuitry. Out-of -limits measurements may be reported to the

IntelliManager™.

[00135] INTELLIMANAGER™ SOFTWARE

[00136] The IntelliNetwork™ is controlled by a software component called

the IntelliManager™. This software runs on a computer such as a workstation, or on a server, or both. The IntelliManager™ coordinates automatic discovery and

notification as new devices are deployed on the network and provides GUI based

configuration of RFID devices for ease of deployment. The IntelliManager™ is able

to set and update custom arrangements of products on shelves. The

IntelliManager™ also provides measuring and reporting of inventory as determined

through the RFID capabilities of the IntelliNetwork™.

[00137] The IntelliManager™ maps the network hardware to a site layout

for easy recognition of devices. IntelliManager™ also handles automatic RF route

management and switching, allowing for sharing of a reader over many antennae,

and providing fault tolerant reads in case of an RF reader fail-over or other system

problems. Upon receiving the fail-over recognition the IntelliManager™ may

automatically redirect requests from the failed or down device or system to other

available devices or systems. It incorporates "plug and play" functionality to auto-

announce and identify new devices on the network. If the RF reader supports

power adjustments, the IntelliManager™ may control the reader output power to

provide optimal RF power levels to any antenna, regardless of physical distance

from the reader.

[00138] FIG. 17 depicts a simplified exemplary deployment of

IntelliManager™ across three sites. An "Enterprise" or centralized IntelliManager™

1200 is shown on a higher level with a database 1205 for inventory data and network configuration information. Also shown at the higher level is

"ItemAuthority" software 1210 which manages the distribution and registration of

unique EPC numbers, as described, for example, previously in U.S. Provisional

Patent Application No. 60/466,760 which is incorporated by reference in its entirety

herein. Also shown at the higher level is "ItemTrack" software 1220 for "track-and-

trace" functionality as described, for example, in previous U.S. Provisional Patent

Application No. 60/545,100, which is incorporated herein by reference in its entirety.

Local or site versions of IntelliManager™ 1241, 1242, and 1243 are shown at a lower

level, along with databases 1246, 1247, and 1248, respectively, and their collections

of network devices 1251, 1252, and 1253, respectively.

[00139] Also at a relatively high level in the hierarchy, as shown, for

example, in FIG. 17, are the IntelliServices™ 1230, a set of web services providing a

variety of functions that are used by the IntelliManager™ at either the Enterprise or

Site level, or both. Some of the IntelliServices™ may also open to the third party

users. IntelliServices™ 1230 are typically available over the Internet, for example

through the SNMP and TCP/IP layer 1235.

[00140] FIG. 18 shows an exemplary "stack" of hardware and software

components as they relate to each other in the IntelliNetwork™.

[00141] The IntelliServices™ 1230 are web services and other software that

provide a user interface, reporting features, and the ability for third party software to access filtered item-level data. IntelliServices™ also maintain a configuration

database used for certain functions of internal IntelliManager™ components (such

as the Object Manager 1320 and Route Manager 1330).

[00142] Data Manager 1300 contains a database of current and historical

data read from RFID tags, as well as some configuration information used for

reporting.

[00143] The Network Device Manager 1310 consists of three functional

parts. Configuration manager 1340 creates a Reader / Writer Instance (program

object) for each physical reader in the network, so that the reader may then be

controlled through the Instance telling the reader when to turn on and when to turn

off, while the Instance receives RFID data from the reader and passes it to the Data

Manager 1300.

[00144] Route Manager 1330 determines RF routes that exist between

readers and antennae, and chooses a route from an RF reader to each antenna that it

serves. The Route Manager also frees up the switched paths after each use, and

synchronizes the activity of multiple readers for the most efficient operation.

[00145] The Object Manager 1320 is responsible for the discovery of new

network devices 1390, and maintains status and configuration information for all devices, including interconnection information. It provides an exemplary software

'network diagram' used by the Route Manager to determine RF routes.

[00146] Reader Instance Manager 1350 and Writer Instance Manager 1360

send requests to the Route Manager 1330 requesting an RF path from a reader to a

specific antenna, allowing use of a reader for multiple antennae by networking

connections from one antenna to another.

[00147] The SNMP interface 1370 sends commands to all network devices

using the Simple Network Management Protocol, an industry standard method of

controlling and monitoring networked devices. Communications with TCI/IP (1380)

may be used in some cases, for example, between a Reader Instance and a reader.

Network Devices 1390 include RF Readers, as well as IntelliRouters™,

IntelliS witches™, IntelliPads™, and shelf assemblies with antenna configurations

tailored to the actual fixtures (shelves, storage racks, bins, etc).

[00148] FIG. 19 shows a block diagram of certain interactions of the

Network Device Manager 1310 that pertain to reading tags. The NDM handles

communications to IntelliNetwork™ devices including IntelliRouter™,

IntelliSwitch™, and IntelliPad™. When an IntelliManager™ starts up, the NDM

will request from the IntelliServices™ 1230 any information that has been stored

about previously discovered devices. However, the NDM also provides active

device discovery through the IntelliNetwork™. At startup, the routers and switches are detected (discovered) as described previously, as depicted by arrows (1) and (2).

Each device determines its neighboring devices, and transfers this information to the

NDM (arrow 3). During operation the NDM continues to monitor the devices to be

aware of any new devices added to the IntelliNetwork™, or any devices that

become disconnected. Besides maintaining device discovery information, the NDM

also provides commands to the IntelliNetwork™ devices to cause RFID data to be

read by the system.

[00149] The Route Manager 1330 acts as a traffic controller managing the

available routes between readers and antennae. It 'intelligently' determines and

maps the most efficient method of routing RF from a reader to any desired antenna

which can be connected to that reader. After the read process is complete for the

antenna, the Route Manager releases the path to make other pathways available for

the next antennae to be read. The Route Manager synchronizes multiple readers so

that they may read simultaneously in the most efficient manner.

[00150] The Object Manager 1320 controls discovery of new devices on the

network, and for each device, maintains a record of current status and all necessary

device information. When the IntelliNetwork™ powers up, and during its

operation, the Object Manager oversees an auto-discovery process. Individual

devices methodically communicate with each other to determine their neighboring

devices, and then communicate this information to the Object Manager, a process which results in automatic device discovery and network mapping. The system

literally knows how devices are connected to each other across the RF network.

[00151] Thereafter, the Object Manager 1320 holds a representation of

every physical device on the IntelliNetwork™, along with a table or map of the

interconnections between devices. The Route Manager 1330 consults this table or

map to determine an RF route to connect a reader to an antenna. This diagram is

also used to provide graphical representations of the IntelliNetwork™ during

system configuration.

[00152] As shown by arrow 4, the Configuration Manager 1340 instructs

the Reader Instance Manager 1350 to creates a Reader Instance 1355 (a software

representation of a reader) for each physical reader in the network, and sends setup

information to the reader instance. Thereafter, the Reader Instance controls the

reader, telling the reader when to turn on and when to turn off. The turn on / turn

off sequence is synchronized with several other factors - first the IntelliRouters™

and IntelliS witches™ must create an RF path to a desired antenna. Then the reader

may be turned on and instructed to read all tags in view. After the IntelliManager™

determines that all tag data has been collected, the reader is turned off, and the RF

path through the IntelliRouters™ and IntelliSwitches™ is "destroyed" (the switched

paths are opened). [00153] The Reader instance manager 1350 first sends configuration data to

each reader instance 1355, (also step 4) indicating which antennae to read and when

to read them. Each reader instance then may operate autonomously as denoted by

arrow 5. In step 6 the reader instance asks the Route Manager 1330 to provide an RF

path from the reader to a specific antenna. Each instance thus may direct its reader's

attention toward multiple antennae in sequence (zone sets), while the Route

Manager arranges for RF connections to be made to the desired antenna. The Route

Manager initially creates a table of routes, then updates this table as needed, for

example if RF connections are changed. The Route Manager may cooperate (step 7)

with the configuration manager 1340 for this and other operations. When a reader

instance requests an RF path, the Route Manager having determined a suitable path

then in step 8 tells the Object manager 1320 what path is needed. In step 9 the

Object Manager sends instructions through SNMP layer 1370 to network devices

1390, instructing the network devices on how to set up the RF path. In step 10, the

Reader Instance 1355, in control of its reader (not shown) via TCP/IP 1380 or other

protocol, performs an RFID read operation for all tags within range of the antenna.

The reader instance receives back the EPC data, and in step 11 passes it on to the

Data Manager. It may also instruct the reader to turn off or go to standby.

[00154] FIG. 20 shows a flow chart of a read operation, which starts in step

1400 with a request to read a zone (that is, a space served by a particular antenna or antennae). This zone is assigned in step 1405 to a particular reader instance (or it

may have been previously assigned). In step 1410 the Reader Instance asks the

Route Manager for a path to the antenna.

[00155] In step 1415, the Route Manager determines (or has already

determined) an appropriate RF path between the reader being used, and the

specified antenna. In step 1420 the network devices are instructed to set up the RF

path. These instructions and several which follow are passed through object

manager 1320, and SNMP layer 1370, to the Network devices 1390.

[00156] SNMP commands are sent to each IntelliDevice™ along the RF

path, indicating which ports to connect to create the path. The IntelliRouter™(s)

and IntelliSwitch™(es) create the requested path to the antenna. In step 1425, a

verification is made that the path has been set correctly. In step 1430, the reader

instance is informed that the path is ready, at which time the reader is given a read

command. In step 1435, the read occurs, with the RF signal traveling through the

created RF pathway. Tag data, received back to the reader, is passed to the Reader

Instance and from there to the Data Manager.

[00157] In step 1440, the Reader Instance Manager having finished the

read, sends a path destruction request to the Route Manager, which in turn sends

SNMP disconnect commands to IntelliDevices™ on the path. The IntelliRouters™

and IntelliSwitches™ along the path route the SNMP commands. The path is destroyed, and in step 1450 the read is finished and the IntelliDevices™ are

available for another read.

[00158] ZONE MANAGEMENT

[00159] FIG.21 shows a block diagram of two reader instances each

reading a different set of zones. Reader instance 1350 has, in the example, created

two reader instances 1351 and 1352. Reader instance 1351 is assigned to read a zone

set 1353 comprised of eight antennae, while reader instance 1352 is assigned to read

a zone set 1354 also comprised of eight antennae. The reader instances, each with its

own reader, may operate independently, while the Route Manager provides the RF

paths and prevents path contention (e.g., signals competing for the same path).

[00160] FIG. 22 shows a block diagram illustrating RF path creation.

Reader instance manager 1350 again is shown with two reader instances 1351 and

1352. In the example, reader instance 1351 requests an RF path to antenna 1015.

The Route manager 1330 on receiving the request sends instructions through the

SNMP layer 1370 to the devices that it has determined to be on the RF path, that is,

IntelliRouter™ 1004 and IntelliSwitch™ 1014. The appropriate circuits are set

within these devices to create an RF path from Reader 50, through IntelliRouter™

1004, through IntelliSwitch™ 1014, and then to Antenna 1015. [00161] FIG. 23 shows a block diagram illustrating RF path destruction.

When the reader instance 1351 finishes with reading antenna 1015, it requests that

the RF path to antenna 1015 be released. The Route manager 1330 on receiving the

request sends instructions through the SNMP layer 1370 to the devices on the RF

path, that is, IntelliRouter™ 1004 and IntelliSwitch™ 1014. The appropriate circuits

are released within these devices to "destroy" the RF path that was just used. The

devices are then ready for another read request.

[00162] A graphical user interface (GUI) permits user to view the

IntelliNetwork™ through a representation of "real world" devices. For example, as

shown in FIG. 24, configuration files 1500 such as XML files define the physical

layout of a site such as a retail store, down to the shelf and zone level. During

configuration of the system, the user defines which devices (such as IntelliRouters™

(not shown), IntelliSwitches™ (1014, 1018, 1019), Antennae (1015, 1016), etc, are

associated with display fixtures such as shelves in a store. The IntelliManager™

provides a GUI representation 1510 so that the user may view the configuration and

inventory results in a format (display fixtures, shelves) familiar to them, rather than

as an electrical diagram.

[00163] Fault reporting supported in IntelliManager™ captures problems

that prevent reading item level tags. For example, IntelliManager™ supports a set

of notifications that let it detect problems specifically affecting tag reading. More importantly, because of the mapping of antennae to specific hardware,

IntelliManager™ is able to apply business context to the errors that are received.

For example, where an EMS is able to report a fault with a specific device, the

IntelliManager™ is able to provide a layer of context that shows which particular

physical shelf assembly and products currently on the shelf (such as DVDs) are

affected by the fault.

[00164] During installation, the ports of the IntelliRouters™ and

IntelliSwitch.es™ are mapped to the actual ports and antennae of the shelf

assemblies. At installation, the shelf assemblies are mapped to the IntelliRouter™

and IntelliS witches™ to which they are connected.

[00165] When messages from the network devices arrive, the system is able

to show the faults on the IntelliManager™ user interface in the form of color-coded

network device faults, as well as showing the shelves affected by the faults.

[00166] FIG. 25 illustrates how any faults on the network devices 1390 are

reported through the SNMP layer 1370, and the Network Device Manager 1310, up

through IntelliServices™ 1230 (including web services 1231). The fault notifications

arrive at the IntelliManager™ GUI 1235 which can display them to a user in "real-

world" fashion 1515, for example, showing exactly which gondola, shelf, or zone is

faulty. [00167] A zone management interface handles the configuration of the

antenna network to provide the user with the ability to control the way individual

zones operate. The antennae of item level shelf assemblies are by necessity close to

each other, to be able to give an accurate location resolution for each item. Because

shelf designs and product types are different sizes and shapes depending on the

application (DVD shelves are one size, music CDs another), the density of antennae

may also change. When the antennae are very close to each other, it is possible, due

to the nature of the RF field, for more than one antenna to power and interrogate the

same passive tag as the read cycle progresses. For example, if three antennae were

powering and reading a single tag, the system would show the same product in

three different zones. To correct this inaccuracy IntelliManager™ applies

sophisticated filtering algorithms at the reader instance level. The reader instance

will often read multiple zones before sending the resulting read data on to the

Network Device Manager.

[00168] The user is able to increase accuracy by sampling the read data

multiple times before confirming that the product reporting at that location is

accurate. The IntelliManager™ user interface provides sampling and read threshold

controls the user can adjust, allowing control over the sampling process. For

example, with Samples per Read set to 5 and Hits per Read set to 4, the reader

instance will read the zone 5 times one after the other, capturing the product reported at the zone. Any of the item level products that are reported at least 4

times, are reported as present to the data manager.

[00169] Related Zones are described in U.S. Provisional Patent Application

No. 60/568,847 which is incorporated by reference in its entirety herein. Related

zones describe which antennae are close to each other and may be able to read the

tags of a zone nearby. Each assembly configuration will include some obvious

internal related zones but may not include less obvious related zones on separate

shelf assemblies or shelves. The user is able to select a zone and then mark which

zones are considered related by selecting two assemblies and associating them with

each other.

[00170] Hot zones may also be defined, which are represented by a zone

that will be read more often than another zone. In a given reader cycle, each zone is

by default read with equal priority. It is possible within the application to specify

that a zone is read more than once per cycle.

[00171] INVENTORY REPORTING - REPLENISHMENT

[00172] As the customers in the store take goods from the shelf, the store

staff uses the replenishment report to identify which products need to be gathered

from the back room. It also informs them where in the front of the store to place these items to bring the shelves to full inventory. Because of the graphical

interpretation, it is easy to see what parts of the store are affected.

[00173] In accordance with a preferred embodiment, other kinds of

electrical power (e.g., direct current (DC)) may be used by the antenna system in

addition to (or substitution for) RF power. For example, direct current (DC) may be

used by the gondola controller 30, as well as by the shelf controllers 40a, etc. and the

antenna boards 20. One or more dedicated wires may provide such electrical

power, or it may be incorporated into the digital communication highway or with

an RF cable. An RF cable may be configured using two conductors (e.g., coaxial

cable), wherein both the center conductor and the sheath conductor are utilized in

the system. While the RF cable carries an RF signal, a DC voltage may be

superimposed on the RF signal, in the same RF cable, to provide DC power to

intelligent stations. Voltage regulators may subsequently be used to control or

decrease excessive voltages to within usable limits. The RF and data

communications could also be combined into a single cable that would carry the RF

and digital data. This combination could be accomplished by converting the digital

data into an RF signal that is at a frequency that does not interfere with the RFID

reader. The RF signal could then be received by the routers and converted back into

the digital data stream. The RF, data, and power lines could also all be combined

into a single communication channel. [00174] While preferred embodiments of the invention have been described

and illustrated, it should be apparent that many modifications to the embodiments

and implementations of the invention can be made without departing from the spirit

or scope of the invention. Any combination of the router or switching functionality

in between a reader and antenna can be used in accordance with preferred

embodiments of the invention. Any number of the same or combination of different

antenna systems or structures (e.g., loop, serpentine, slot, etc., or variations of such

structures) may be implemented on an individual shelf, antenna board, shelf back,

divider or other supporting structure.

[00175] Although embodiments have been described in connection with the

use of a particular exemplary shelf structure, it should be readily apparent that any

shelf structure, rack, etc. (or any structure) may be used in selling, marketing,

promoting, displaying, presenting, providing, retaining, securing, storing, or

otherwise supporting an item or product or used in implementing embodiments of

the invention.

[00176] Although specific circuitry, components, or modules may be

disclosed herein in connection with exemplary embodiments of the invention, it

should be readily apparent that any other structural or functionally equivalent

drcuit(s), comρonent(s) or module(s) may be utilized in implementing the various

embodiments of the invention. [00177] The modules described herein, particularly those illustrated or

inherent in, or apparent from the instant disclosure, as physically separated

components, may be omitted, combined or further separated into a variety of

different components, sharing different resources as required for the particular

implementation of the embodiments disclosed (or apparent from the teachings

herein). The modules described herein, may, where appropriate (e.g., reader 50,

primary controller 100, inventory control processing unit 130, data store 140,

combination routers 600, 601, 602, logical unit 605, data router 610, RF router 650,

etc.) be one or more hardware, software, or hybrid components residing in (or

distributed among) one or more local and/or remote computer or other processing

systems. Although such modules may be shown or described herein as physically

separated components (e.g., data store 140, inventory processing unit 130, primary

controller 100, reader 50, gondola controller 30, shelf controller 40a, 40b, 40c, etc.), it

should be readily apparent that the modules may be omitted, combined or further

separated into a variety of different components, sharing different resources

(including processing units, memory, clock devices, software routines, etc.) as

required for the particular implementation of the embodiments disclosed (or

apparent from the teachings herein). Indeed, even a single general purpose

computer (or other processor-controlled device such as an Application Specific

Integrated Circuit (ASIC)), whether connected directly to antennae 10, antenna

boards 20, gondolas 70, or connected through a network 120, executing a program stored on an article of manufacture (e.g., recording medium such as a CD-ROM,

DVD-ROM, memory cartridge, etc.) to produce the functionality referred to herein

may be utilized to implement the illustrated embodiments.

[00178] One skilled in the art would recognize that inventory control

processing unit 130 could be implemented on a general purpose computer system

connected to an electronic network 120, such as a computer network. The computer

network can also be a public network, such as the Internet or Metropolitan Area

Network (MAN), or other private network, such as a corporate Local Area Network

(LAN) or Wide Area Network (WAN), Bluetooth, or even a virtual private network.

A computer system includes a central processing unit (CPU) connected to a system

memory. The system memory typically contains an operating system, a BIOS

driver, and application programs. In addition, the computer system contains input

devices such as a mouse and a keyboard, and output devices such as a printer and a

display monitor. The processing devices described herein may be any device used

to process information (e.g., microprocessor, discrete logic circuit, application

specific integrated circuit (ASIC), programmable logic circuit, digital signal

processor (DSP), Microchip Technology Inc. PICmicro® Microcontroller, Intel

Microprocessor, etc.).

[00179] The computer system generally includes a communications

interface, such as an Ethernet card, to communicate to the electronic network 120. Other computer systems may also be connected to the electronic network 120. One

skilled in the art would recognize that the above system describes the typical

components of a computer system connected to an electronic network. It should be

appreciated that many other similar configurations are within the abilities of one

skilled in the art and all of these configurations could be used with the methods and

systems of the invention. Furthermore, it should be recognized that the computer

and network systems (as well as any of their components) as disclosed herein can be

programmed and configured as an inventory control processing unit to perform

inventory control related functions that are well known to those skilled in the art.

[00180] In addition, one skilled in the art would recognize that the

"computer" implemented invention described herein may include components that

are not computers per se but also include devices such as Internet appliances and

Programmable Logic Controllers (PLCs) that may be used to provide one or more of

the functionalities discussed herein. Furthermore, while "electronic" networks are

generically used to refer to the communications network connecting the processing

sites of the invention, one skilled in the art would recognize that such networks

could be implemented using optical or other equivalent technologies. Likewise, it is

also to be understood that the invention utilizes known security measures for

transmission of electronic data across networks. Therefore, encryption,

authentication, verification, and other security measures for transmission of electronic data across both public and private networks are provided, where

necessary, using techniques that are well known to those skilled in the art.

[00181] Moreover, the operational flow and method shown in, and

described with respect to, FIG. 9, for example, can be modified to include additional

steps, to change the sequence of the individual steps as well as combining (or

subdividing), simultaneously running, omitting, or otherwise modifying the

individual steps shown and described in accordance with the invention. Numerous

alternative methods may be employed to produce the outcomes described with

respect to the preferred embodiments illustrated above or equivalent outcomes.

[00182] It is to be understood therefore that the invention is not limited to

the particular embodiments disclosed (or apparent from the disclosure) herein, but

only limited by the claims appended hereto.

Claims

CLAIMSWhat is claimed as new and desired to be protected by Letters Patent of theUnited States is:

1. A method of transporting signals to an RFID reader antenna, the method

comprising the steps of:

selecting a first communication route for transporting at least one RF signal from an RFID reader to at least one RFID antenna;

selecting a second communication route for transporting at least one digital signal from a first controller to a second controller;

transporting the at least one RF signal to the RFID antenna along the first communication route; and

transporting the at least one digital signal to the second controller along the second communication route.

2. The method of claim 1, wherein the steps of selecting a first and second

communication route respectively comprises selecting a communication route in

accordance with a routing method.

3. The method of claim 2, wherein the routing method is selected from the group

consisting of: operational readiness, RIP, IGRP, OSPF and EIGRP.

4. The method of claim 1, wherein the steps of selecting a first communication

route and selecting a second communication route result in selection of first and

second communication routes sharing substantially the same communication route

for transporting both digital signals and RF signals.

5. The method of claim 1, wherein the steps of selecting a first communication

route and selecting a second communication route result in selection of first and

second communication routes substantially different for transporting digital signals

than for transporting RF signals.

6. The method of claim 1, further comprising a step of dividing the digital signal

into data packets for transporting over the second communication route.

7. The method of claim 6, further comprising a step of dividing the data packets

into smaller packets.

8. The method of claim 6, further comprising_. a step of combining the data packets

into larger data packets.

9. The method of claim 1, wherein the step of providing a first controller is

performed by a controller selected from the group consisting of a shelf controller, a

gondola controller, and a primary controller.

10. The method of claim 1, further comprising a step of providing a combination

router for performing the steps of transporting the at least one RF signal and

transporting the digital signal from the combination router to the second controller.

11. The method of claim 10, further comprising transporting the at least one digital

signal to a third controller; and wherein the combination router switches a plurality

of routes at the same time.

12. The method of claim 1, wherein the at least one digital signal comprises at least

one data signal.

13. An RFID enabled system comprising:

at least one RFID antenna system; and

at least one combination device for selecting a communication route for transporting at least one RF signal to the at least one RFID antenna system and for transporting at least one digital signal to the at least one RFID antenna system.

14. The RFID enabled system of claim 13, wherein the at least one combination

device comprises at least one combination router,

wherein the at least one combination router further comprises at least one

logical unit capable of selecting a communication route to transport the at least

one RF signal to the at least one RFID antenna system.

15. The RFID enabled system of claim 13, wherein the at least one combination

device comprises at least one combination router,

wherein the at least one combination router further comprises at least one

logical unit capable of selecting a communication route to transport the at least

one digital signal to the at least one RFID antenna system.

16. The RFID enabled system of claim 14, wherein the at least one combination

router further comprises at least one data router and at least one RF router, wherein

the at least one data router is capable of transporting digital signals to an RFID

controller on the at least one RFID antenna system, and the at least one RF router is

capable of transmitting RF signals from an RFID reader to the RFID antenna system.

17. The RFID enabled system of claim 13, wherein the communication route selected

by the combination device for digital signals is substantially the same as the

communication route selected by the combination device for the RF signal.

18. The RFID enabled system of claim 13, wherein the communication route selected

by the combination device for the digital signal is substantially different from the

communication route selected by the combination device for the RF signal.

I

19. The RFID enabled system of claim 18, wherein the at least one digital signal is

divided in packets for transmission over the communication route.

20. The RFID enabled system of claim 13, wherein the communication route selected

by the combination device for RF signals is substantially the same as the

communication route selected by the combination device for the digital signal.

21. The RFID enabled system of claim 13, wherein the communication route selected

by the combination device for the RF signal is substantially different from the

communication route selected by the combination device for the digital signal.

22. The RFID enabled system of claim 13, wherein the communication route selected

by the combination device for digital signals is similar to the communication route

selected by the combination device for the RF signal.

23. The RFID enabled system of claim 13, further comprising a primary controller

coupled to the combination device, wherein the primary controller transmits signals

to the combination device.

24. The RFID enabled system of claim 23, further comprising:

an electronic network;

a plurality of readers; and

a plurality of primary controllers, wherein at least one primary controller is coupled to the electronic network, and wherein the at least one combination device comprises first and second combination devices; wherein at least one of the plurality of primary controllers is coupled to both the first and second combination device, and wherein at least one of the plurality of readers is coupled to both the first and second combination device.

25. The RFID enabled system of claim 24, wherein the electronic network is selected

from the group consisting of: the Internet, a local network, Ethernet, CAN, serial,

LAN, and WAN.

26. The RFID enabled system of claim 23, further comprising an RF reader coupled

to the combination device, wherein the RF reader transmits signals to the

combination device.

27. The RFID enabled system of claim 26, wherein the primary controller is coupled

to an electronic network.

28. The RFID enabled system of claim 13, further comprising:

a primary controller; and

an RF reader,

wherein the primary controller controls the RF reader.

29. The RFID enabled system of claim 13, further comprising a plurality of

combination devices connectable to network devices selected from the group

consisting of: combination routers, combination switches, and controllers.

30. The RFID enabled system of claim 29, further comprising:

a primary controller; and

an RF reader,

wherein the primary controller and RF reader are each connectable to at

least two of the plurality of combination device.

31. The RFID enabled system of claim 29, wherein the plurality of combination

device comprises a plurality of combination routers,

wherein each of the plurality of combination routers comprises a logic

unit.

32. The RFID enabled system of claim 31, wherein each logic unit is capable of

communicating with at least one other logic unit.

33. The RFID enabled system of claim 29, wherein the primary controller controls

route optimization and selection.

34. The RFID enabled system of claim 29, further comprising a plurality of primary

controllers, wherein the plurality of primary controllers controls route optimization

and selection.

35. The RFID enabled system of claim 29, wherein at least one of said plurality of

combination devices controls route optimization and selection.

36. The RFID enabled system of claim 29, wherein the network controls route

optimization and selection, and at least one of said plurality of combination devices

transports a plurality of routes substantially simultaneously.

37. The RFID enabled system of claim 13, wherein the at least one combination

device determines a communication route based on operational readiness of devices

along the route.

38. The RFID enabled system of claim 13, wherein the combination device is

configured to perform a system diagnostic.

39. The RFID enabled system of claim 13, wherein the combination device is

configured transmit a status.

40. The RFID enabled system of claim 39, wherein the transmitted status is based on

real-time or logged information.

41. The RFID enabled system of claim 13, wherein the at least one digital signal

comprises at least one data signal.

42. A combination router for transmitting signals to an RFID antenna system,

comprising: at least one logical unit for selecting a first communication route to transport signals to an RFID antenna system, and for selecting a second communication route to transport a digital signal from a controller;

at least one RF router for transporting an RF signal to the RFID antenna system along the first communication route; and

at least one data router for transporting the digital signal from the controller along the second communication route.

43. The combination router of claim 42, wherein the data router has at least two

inputs/outputs for transporting digital signals; and

wherein the RF router has at least two inputs/outputs functioning as an input port or output port at any given time for transporting RF signals.

44. The combination router of claim 42, wherein:

the data router has at least four inputs/outputs for transporting digital

signals;

the RF router has at least a first set and a second set of inputs/outputs for

transporting RF signals from the at least a first set of inputs/outputs to the at

least a second set of inputs/outputs; and

the logical unit is capable of selecting the first and second communication

routes as substantially the same.

45. The combination router of claim 42, wherein the logical unit is capable of

selecting the first and second communication routes as substantially different routes.

46. The combination router of claim 42, wherein the logical unit is capable of

selecting the first and second communication routes as substantially the same

routes.

47. The combination router of claim 42, wherein:

the digital signal is divided in packets for transportation over the selected

communication route; and

the packet is stored in local memory in the combination router prior to

transportation over the selected communication route.

48. The combination router of claim 42, wherein the RF router comprises a switch.

49. The combination router of claim 42, wherein the RF router comprises a set of

switches.

50. The combination router of claim 42, wherein the data router operates according

to a routing method.

51. The combination router of claim 50, wherein the routing method is selected from

the group consisting of: operational readiness, RIP, IGRP, OSPF and EIGRP.

52. The combination router of claim 42, wherein the RF router operates according to

a routing method.

53. The combination router of claim 52, wherein the routing method is selected from

the group consisting of: operational readiness, RIP, IGRP, OSPF and EIGRP.

54. A combination switch for transmitting signals, comprising:

at least one first router for transporting a first type of signal to a device along a first communication route; and

at least one second router for transporting a second type of signal from a controller along a second communication route.

55. The combination switch of claim 54, wherein:

the first type of signal comprises an RF signal; and

the second type of signal comprises a data signal.

56. The combination switch of claim 55, further comprising at least one logical unit

for selecting the first communication route to transport the RF signal to the device,

and for selecting the second communication route to transport the data signal from

the controller to an antenna.

57. The combination switch of claim 56, wherein the at least one logical unit selects

the first and second communication routes according to a routing protocol.

58. The combination switch of claim 57, wherein the routing protocol is selected

from the group consisting of: operational readiness, RIP, IGRP, OSPF and EIGRP.

59. The combination switch of claim 54, wherein the first and second routers are

capable of transporting a plurality of signals simultaneously.

60. A network for transporting signals to an antenna, the network comprising:

a plurality of network devices for receiving and communicating signals over the network, wherein each network device has a unique address; and

a manager unit for controlling the network and for coordinating identification and notification of the plurality of network devices;

wherein activated ones of the plurality of network devices notify the manager unit upon activation on the network.

61. The network of claim 60, further comprising:

a protocol server for assigning protocol addresses to activated ones of the plurality of network devices.

62. The network of claim 60, wherein the manager unit queries each activated

network device to determine a network topology and maps the network topology to

a site layout to recognize network devices.

63. The network of claim 60, wherein the signals comprise a type selected from the

group consisting of: RF for RFID applications, RF for non-RFID applications, DC

pulse communications, or voltage-level based communications.

64. The network of claim 60, wherein the manager unit comprises:

a configuration manager for controlling activation/deactivation of RFID reader devices in the network;

a route manager for determining and selecting RF routes between RFID reader devices and RFID antennae in the network, wherein the route manager tears down selected routes after use; and

an object manager for discovering new network devices on the network, and for maintaining status and configuration of such network devices.

65. The network of claim 64, wherein the manager unit provides fault notification.

66. The network of claim 65, wherein the fault notification comprises a fail-over

recognition.

67. The network claim of 66, wherein upon receiving the fail-over recognition the

configuration manager automatically redirects requests from a failed or down

device or system to other available devices or systems.

68. The network of claim 60, wherein each activated one of the plurality of network

devices identifies neighboring active network devices and provides information of

such neighboring devices to the manager unit.

69. The network of claim 68, wherein one of the plurality of network devices is a

combination digital data/RF signal router for routing digital data as network data

packets to a selected RFID reader, wherein the combination router exchanges

protocol address information with a neighboring network device and sends the

information of such neighboring device to the manager unit.

70. The network of claim 68, wherein one of the plurality of network devices is a

routing switch for bypassing a received RF signal on to another network device or

connecting RF power to one of several RFID antennae connected to the routing

switch.

71. The network of claim 68, wherein one of the plurality of network devices is an

RFID pad for reading and writing RFID tags.

72. The network of claim 60, wherein at least one of the plurality of network devices

includes sensors for at least one of: determining RF power; allowing remote control

of RF power of the network device; and measuring RF forward and RF reverse

power for determining system connectivity, performance and tuning measurements.

73. The network of claim 60, wherein the manager unit provides measuring and

reporting of inventory based on performance of the network.

74. A method of transporting signals to an RFID reader antenna, the method

comprising the steps of:

selecting a first communication route for transporting at least one RF signal from an RFID reader to at least one RFID antenna;

selecting a second communication route for transporting at least one digital signal from a first controller to a second controller;

transporting the at least one RF signal to the RFID antenna along the first communication route; and

transporting the at least one digital signal to the second controller along the second communication route.

75. The method of transporting of claim 74, the method further comprising the step

of performing a system diagnostic.

76. The method of transporting of claim 75, wherein said step of performing a

system diagnostic is performed by a combination router.

77. The method of transporting of claim 75, wherein said step of performing a

system diagnostic comprises sending a switch notification indicating when an

external switch on the combination router is activated.

78. The method of transporting of claim 75, wherein said step of performing a

system diagnostic comprises sending a critical voltage notification indicating the

combination router power supply exceeds minimum or maximum limits.

79. The method of transporting of claim 75, wherein said step of performing a

system diagnostic comprises sending an external power supply error notification if

the combination router external power supply malfunctions.

80. The method of transporting of claim 75, wherein said step of performing a

system diagnostic comprises sending a peripheral power supply error notification if

the power supplied to a device connected to the combination router exceeds a

current draw or voltage threshold.

81. The method of transporting of claim 75, wherein said step of performing a

system diagnostic comprises sending a temperature alarm if the maximum allowed

temperature of the combination router has been reached.

82. The method of transporting of claim 75, wherein said step of performing a

system diagnostic comprises sending an RF output fault notification if there is an RF

signal problem with the combination router.

83. The method of transporting of claim 75, wherein said step of performing a

system diagnostic comprises sending an output port disconnected notification when an output port state of the combination router is changed from a connected state to a

disconnected state.

84. The method of transporting of claim 75, wherein said step of performing a

system diagnostic comprises sending a Voltage Standing Wave Ratio (VSWR) limit

notification when an RF port on the combination router has exceeded the high or

low VSWR limit.

85. The method of transporting of claim 75, wherein said step of performing a

system diagnostic comprises sending a neighbor device output port change

notification to the first or second controller when the RF output port neighbor has

changed.

86. The method of transporting of claim 75, wherein said step of performing a

system diagnostic comprises sending a neighbor device input port change

notification to the network when the RF input port neighbor has changed.

87. The method of transporting of claim 74, the method further comprising the steps

of:

determining at least one adjacent second node to which it has a direct RF communication path; and

relaying the identity of the adjacent second node to the primary controller; wherein the step of selecting a first communication route comprises selecting a communication route in accordance with a routing method.

88. The method of transporting of claim 87, wherein the routing method is selected

from the group consisting of: operational readiness, RIP, IGRP, OSPF, and EIGRP.

89. The method of transporting of claim 87, wherein the step of selecting a first

communication route is based on selection of a second communication route in

accordance with a routing method.

90. The method of transporting of claim 89, wherein the routing method is selected

from the group consisting of RIP, IGRP, OSPF, and EIGRP.

91. The method of transporting of claim 74, wherein the step of selecting a first

communication route comprises an automated determination of available RF

communication routes.

92. The method of transporting of claim 91, wherein the automated determination of

available RF communication routes comprises a first node on the communication

route determining at least one adjacent second node to which it has a direct RF

communication path, and relaying the identity of the adjacent second node to the

primary controller.

93. The method of transporting of claim 92, wherein the step of determining an

adjacent second node comprises sending identifying information over the direct RF

communication path between the first node and the adjacent second node.

94. The method of transporting of claim 93, wherein identifying information is the

media access control (MAC) address of a node selected from the group consisting of:

of the first node, the adjacent second node, or both nodes.

95. The method of transporting of claim 94, wherein the identifying information is

transmitted by digital signals over the RF direct communication path.

96. The method of transporting of claim 94, wherein the identifying information is

transmitted by RF signals over the RF direct communication path.

97. The method of transporting of claim 92, further comprising additional nodes

relaying the identities of their adjacent nodes to the primary controller.

98. The method of transporting of claim 97, further comprising a step of the primary

controller determining an RF communication path between an RFID reader

connected to a node on the communication path and an RFID antenna connected to

a node on the communication path.

99. The method of transporting of claim 98, wherein the primary controller directs

the nodes along the determined communication path to activate switches at the

nodes to complete the determined RF communication path.

100. The method of transporting of claim 92, further comprising after a

predetermined period of time, a redetermination of adjacent devices by one or more

nodes, and again relaying this adjacency information to the primary controller,

whereby the primary controller is capable of making a revised automatic

determination of RF communication paths.

101. The method of transporting of claim 92, further comprising, measuring

characteristics of an RF signal at at least one of the nodes using a sensor.

102. The method of transporting of claim 101, wherein the sensor measures a

characteristic of at least part of an RF signal.

103. The method of transporting of claim 101, wherein the RF signal is generated by

an RFID reader connected to an RF communication route.

104. The method of transporting of claim 101, wherein the RF signal is generated by a

device within the node.

105. The method of transporting of claim 104, wherein the RF generating device is a

voltage controlled oscillator (VCO).

106. The method of transporting of claim 105, wherein the VCO generates RF at one

or more frequencies, or a range of frequencies.

107. The method of transporting of claim 101, wherein the sensor measures

transmitted or reflected RF power.

108. The method of transporting of claim 107, wherein the sensor measures VSWR.

109. The method of transporting of claim 108, wherein an alert is generated based on

the sensor measurement.

110. The method of transporting of claim 107, wherein the primary controller adjusts

the reader power based on the sensor measurement.

111. The method of transporting of claim 107, wherein the primary controller or the

node adjusts the tuning of an antenna based on the VSWR measurement.

112. The method of transporting of claim 107, wherein the antenna tuning adjustment

is made using a voltage controlled capacitor.

113. The method of transporting of claim 107, wherein the primary controller

determines whether to use a communication path or portion thereof based on the

sensor measurement.

114. The method of transporting of claim 107, wherein the primary controller

determines whether to read an antenna based on the sensor measurement.

115. The method of transporting of claim 107, wherein the primary controller

determines whether to select an alternate communication path or portion thereof

based on the sensor measurement.

116. The method of transporting of claim 91, the method further comprising mapping

an RFID antenna onto a physical location selected from the group: a shelf, a fixture,

an aisle, a department, and a building.

117. The method of transporting of claim 116, the method further comprising

automatically relating received data received from the mapped antenna to the

physical location, wherein the received data includes information from the group:

item identification, item quantity, antenna status, and antenna fault.

118. The method of transporting of claim 116, wherein the facility is a retail store,

pharmacy, storeroom, warehouse, distribution center, or factory.

119. A method of transporting signals to an RFID reader antenna through a network,

the method comprising the steps of:

selecting a first communication route for transporting at least one RF signal output from an RFID reader to at least one RFID antenna;

selecting a second communication route for transporting at least one digital signal from a first controller to a second controller; transporting the at least one RF signal to the RFID antenna along the first communication route;

transporting the at least one digital signal to the second controller along the second communication route;

detecting the at least one RF signal output at at least one location in the network; and

controlling the RFID reader based on the detecting step.

120. The method of transporting signals as recited in claim 119, wherein:

the detecting step detects, at the location of the at least one RFID antenna,

the signal characteristics of the at least one RF signal output from the RFID

reader and received at the at least one RFID antenna; and

the controlling step comprises controlling RF power level of the output

from the RFID reader based on the detecting step.

121. The method of transporting signals as recited in claim 120, wherein the detecting

step uses a sensor located at the location of the at least one RFID antenna to detect

the signal characteristics of the at least one RF signal output from the RFID reader.

122. The method of transporting signals as recited in claim 119, wherein the

controlling step comprises controlling a frequency of activation of the RFID reader

based on the detecting step.

123. A method of operating an RFID system comprising:

a) performing a self-check of operability with at least one combination

router;

b) communicating results of the self-test to at least one additional

component;

c) determining an antenna to be read;

d) determining an available RFID reader; and

e) determining at least one available first and second route for a first and

a second signal respectively to be sent from an RFID reader to the antenna to be

read.

124. The method of claim 123, wherein the step of performing a self -check comprises

an integrity check.

125. The method of claim 124, wherein the integrity check comprises determining

which input/output ports of the at least one combination router are in

communication with the system.

126. The method of claim 125, wherein the integrity check comprises identifying what

device is connected to each input/output port of the at least one combination router.

127. The method of claim 124, wherein the integrity check is performed with real-time

or logged data.

128. The method of claim 123, further comprising f) selecting a first route for the first

signal.

129. The method of claim 128, further comprising g) establishing a first signal

connection between the network and the first signal along the selected route.

130. The method of claim 129, further comprising h) verifying the first signal

connection between the network and the first signal along the selected route.

131. The method of claim 130, further comprising i) determining if the first signal

connection is verified.

132. The method of claim 131, further comprising j) repeating steps f) through i) if the

first signal connection is not verified.

133. The method of claim 131, further comprising k) selecting a second route for the

second signal if the connection is verified.

134. The method of claim 133, further comprising 1) establishing a second signal

connection between the network and the second signal along the selected route.

135. The method of claim 134, further comprising m) verifying the second signal

connection between the network and the first signal along the selected route.

136. The method of claim 135, further comprising n) determining if the second signal

connection is verified.

137. The method of claim 136, further comprising o) repeating steps k) through n) if

the second signal connection is not verified.

138. The method of claim 136, further comprising:

supplying power to the selected RFID reader if the second signal

connection is verified; and

interrogating the antenna to be read.

139. The method of claim 138, further comprising storing the results of the step of

interrogating the antenna to be read.

140. The method of claim 138, further comprising decreasing power supplied to the

selected RFID reader.

141. The method of claim 140, further comprising determining if a status update is

needed.

142. The method of claim 141, further comprising repeating steps a) and b) if it is

determined that a status update is needed.